Question

What component allows ICs to determine whether or not a signal on a data line is a 0, a 1, or undetermined?​

Answer 1

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Answer 2

In an IC the pins and where they are connected, i.e., ground or VCC determine whether or not a signal on a data line is a 0, a 1, or undetermined. While working with ICs and microcontrollers, you'll probably experience sticks that are active-low and pins that are active-high.

• Basically, this simply portrays how the pin is actuated. Assuming it's an active-low pin, you should "pull" that trigger LOW by associating it to the ground. For an active-high pin, you interface it to your HIGH voltage (typically 3.3V/5V).
• For example, suppose you have a shift register that has a chip empower pin, CE. Assuming you see the CE pin anyplace in the datasheet with a line over it like this, CE, then, at that point, that pin is active-low.
• The CE pin would be pulled to GND for the chip to become empowered. On the off chance that, in any case, the CE pin doesn't have a line over it, it is active high, and it should be pulled HIGH to empower the pin.
• Numerous ICs will have both active-low and active-high pins mixed. Simply make certain to twofold check for pin names that have a line over them. The line is utilized to address NOT (otherwise called bar). When something is NOTTED, it changes to the contrary state. So if active-high information is NOTTED, it is currently active-low. Straightforward as that!